'The Flash' And 'Arrow' Crossover In Musical Promo; Will Oliver And Barry Meet Again In New Episodes? [VIDEO]

Barry Allen (Grant Gustin, left) from "The Flash" and Oliver Queen (Stephen Amell, right) from "Arrow," pictured in the "Flash" Season 1, appear together in a joint promo for both shows' upcoming seasons. Photo: The CW

"The Flash" and "Arrow" just had another crossover! While the two CW superhero series have yet to premiere their new seasons -- "The Flash" Season 2 begins Tuesday, Oct. 6, while "Arrow" Season 4 kicks things off the next night on Oct. 7 -- the shows have joined forced for a new teaser promoting their upcoming episodes. The promo may not have much by way of new footage, but fans will be dancing for joy for completely different reasons.

In the new promo, previously seen clips of Oliver Queen (Stephen Amell) and Barry Allen (Grant Gustin) in action are spliced together and set to some club-ready beats. The teaser is framed by shots of a silhouetted DJ with standout quotes from the series and the two shows' theme songs ready on the ones and twos, blending them all together in a mashup that is sure to get loyal viewers excited for the new seasons.

Watch the new promo below:

While this crossover of "The Flash" and "Arrow" might just be a teaser, the two superheroes will join forces again for real this fall. According to Entertainment Weekly, the two shows' timelines will collide near each series' midseason finale for a storyline that will introduce "DC's Legends of Tomorrow," an upcoming spinoff set in the same universe and also airing on the CW. The series will center on Rip Hunter (Arthur Darvill), a roguish time traveler who returns to the present to recruit of group of heroes, many coming from the "Arrow" and "The Flash" universes, to stop a futuristic supervillain from destroying the world.

Watch the trailer for "DC's Legends of Tomorrow" below:

While fans may have to wait until then to see DC worlds collide, it would not be surprising if the shows introduced some more minor crossover fun in earlier episodes, such as when Felicity Smoak (Emily Bett Rickards) from "Arrow" paid a visit to Central City in an early episode of "The Flash."

What will happen when Barry Allen and Oliver Queen meet again? Fans will have to wait to find out. "The Flash" Season 2 debuts Oct. 6 and "Arrow" Season 4 premieres on Oct. 7.